The Wattstopper UT-305-3 is a low-voltage ultrasonic ceiling occupancy sensor designed for automatic on/off lighting control in offices, conference rooms, and open-plan commercial spaces. Operating at 24VDC, it delivers reliable detection across a 2,000 sq ft coverage area using ultrasonic technology that responds to minor motion, including small movements that passive infrared sensors may miss. Ceiling-mount installation integrates with Wattstopper low-voltage lighting control systems for code-compliant occupancy-based energy savings.